#chat {
  position: relative;
}

#chat > *:not(#custom-chat-frame) {
  display: none !important;
}

#custom-chat-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

#chat.show-native-chat > *:not(#custom-chat-frame) {
  display: revert !important;
}

#chat.show-native-chat #custom-chat-frame {
  display: none !important;
}